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Math Help - probability values

  1. #1
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    probability values

    Hello, I need help, which of the following represent valid probibility values?
    0
    100%
    -0.8
    0.001
    thanks again
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by mkcar View Post
    Hello, I need help, which of the following represent valid probibility values?
    0
    100%
    -0.8
    0.001
    thanks again
    when written in terms of a decimal, a valid probability value, call it P, ranges from 0 \leq P \leq 1

    when written as a percentage: 0 % \leq P \leq 100%


    Note: when an event is certain, it has a probability of 1 or 100%, when an event is impossible, it has a probability of 0
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  3. #3
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    Quote Originally Posted by Jhevon View Post
    Note: when an event is certain, it has a probability of 1 or 100%, when an event is impossible, it has a probability of 0
    But not the other way around. An event can be possible and still have probability 0, and not be certain and have probability 1.

    RonL
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    How? By subjective probability from intuition, guesses, and estimates?
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    Quote Originally Posted by rualin View Post
    How? By subjective probability from intuition, guesses, and estimates?
    What are you refering to?

    RonL
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    Quote Originally Posted by CaptainBlack View Post
    But not the other way around. An event can be possible and still have probability 0, and not be certain and have probability 1.

    RonL
    Sorry, I forgot to quote. My question was, "How can it be that an event that's possible has a probability of 0 and one that is not certain has a probability of 1?"
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  7. #7
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    Quote Originally Posted by rualin View Post
    Sorry, I forgot to quote. My question was, "How can it be that an event that's possible has a probability of 0 and one that is not certain has a probability of 1?"
    Suppose the lengths of rods are distributed normaly with mean mu and sd sigma.

    Then it is possible for a rod to have length mu+signa/3, but the probability that it does is zero.

    This is a toy construction but there are real cases where this can be important (fractal noise
    comes to mind).

    RonL
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